Nonbuckling damper for high temperature flues



Feb. 12, 1935.'A I E F, A FAHRENWALD 1,991,016

NONBUCKLING DAMPER FORHIGH TEMPERATURE FLUES `Filed Sept. 29, 1930 Patented Feb. 12, 51.9351 y This; invention relates toadamper :for ues in which it is necessary to t control the `flow Aofgases 4of veryhigh temperatures, and particularly" to a damperoi: the sliding lgatetype; ,x11-

`. The present invention provides da' `damper `which;independently of articial cooling. inuences,l will* l withstandi g extreme heat Without buckling;` andV one which twillxpconformwto `its seat t or slideV track neven though .theilatter,be.- ccome fdistorted by unequal expansion` orvfdistoritiongof .masonry inwwhichait is rmounted;.,falso Vconstrlmicts the :damper seat or slide f trackgin a manner to :prevent ,itv embracingv the `damper to an; extent which would .resist ,slidingumoviement ,ofi-A thewlfclamper` `under :such` conditions.: off distortion; i and`A these conditions @arev realized inv i a damper which, while composed of separatepanels or sectionsywill Vbeassembled as agunit-without the;.emp10`yment1 fof an assembly. framefior Y connecting n bar, but withf ,the individual` units of-the ,damperv interfconnected;l or articulated in la manner fto; render them '.mutually Y .sustaining whether, the damper t be suppjortedriby` suspension through means of; itsuppermost `memberiafonin a columnl `with each `section `resting .A by" gravity v`upon theonefbeneath Yit, hereinafter; referredi-to as ,columnarisupport andsin `which-,the .damper `.in addition s ftovbing .iexbly y intersup: ported,-have their articulations so designedand ,provided with such tolerance `,between *the interlocking :pa-rtslthat t some relativmovement per;- pendicular to the plane of the damperiwillibe permitted; and even with-fminoi; t irregularities in the slide track and notwithstanding, theilunits are; interlocked against separation; "one unitgcanfnoty hold; an adjacent unit` Voit its.` seat on; kthe slide:.traclg.V i g Moreover,;` in the" preferrem` form of .kthez invention; intersupport among the iunits,

alignktlflief` units in Ithel'plane of the dampersfi`` be :not .onlytdivided up into individual units :,.o'fl relativelysmallvertica1 dimension; butfthat t 4 ,theseunits'be articulated ina manner tofaiord .atileas't limitedrexibilityf in the1articul'ations;f0r

` :'iiexibility:suicientttopermitithe damper to'con# `fformtot-an irrlegulax"trackvor` seat; and the :articulations must? also be 'suchxthat iiexibility l pe 'support and ijn-:addition to, these. conditions' lof articulation, 4it lis `desirable Lto.: haveiltlie` intern-` support existing between the sectionsiwhether columnar` support. or supporti by suspension, fimpairtedithrough `themediumof impinging surfaces of sufficient area andappropriate angular direction :tof oppose ,relative rocking i movement A when undexzxvertical loadiineither :.direction; not-a withstanding limited l flexibility i neededsfor conx-I siveu proportions@ as"` distinguished ,-from' :f1-sheet metal construction; it is :desirable to. `design@` .the

articulations With'vspecial,referencemto thexpro-` duction` of-tthe .dampensectionslbyn foundry methoda5wy l v.

aumeansyfor realizing the-:conditionsabove Vforming the-L` damper to its seat .tbyzxtolerance` enumerated, the invention :contemplates a :series A of `enamel-alike damper sections; relatively narrow .vertically but-which mam conform in t 1ength.. to

the ,1 full:` lateralifdimensionoi the damper; have ing; these tsectionsi madecirn massive form r. with articulating means; .along their meeting edges involving non-rotatableatongueeand-groove ele'- .mentsreceived-` the one withintheipthenwith suflicienbwtolerance to permit'slight;` flexibility` Nvhile resisting k iiexibility sufficient to permit! the Adamper Lto; ucllapsea.the` faces of thevtongue-and-ll I 'groovebwhich ,enten into',impingement,whilenthe through g1 which the units bearA one'` against" the other, either. upwardly ori; downwardly;` i are in- @clined to- .bothf the vertical andhorizontall planes',

*sol as? to` deflect; thel'unit `intof'th'ey plane] of f the 4,support to oA receiveyit fromgeach of theadjaicent:Udampemsectionsi@wiinbefree .toiexpand `and i contract :independently n of v the. :adj acentz sections,

Reach;damperisection, whileiadaptedztowtransmit a as Well as to slide laterally in the plane of the damper independently of the other sections. In the accompanying drawing, in which one general embodiment of the damper arrangement and six different designs of articulation construction are shown- Figure 1 isa sectional view of a portion of a furnace flue and a damper together with the slide tracl; upon which ,the dam-per seats, intermediate portions ofthe overhead guiding means being broken away. Figure 1a is a section on the line laxlax of Figure 1.

lFigure 2 is a face View of a portionr ofathe damper and slide track shown inilgurejl; an

intermediate portion of the damper being lbroken away.

Figure 3 is a detail View of( the esign of articulation shown in Figure 1. I

Figures 4, 5, 6, 7 and 8 are sectional viewsl showing modified designs of articulating cony struction; and f v :Figure 19 is a face view showing av lugmentary portion :of the ynonstruction shown. in `Figure 8; v

.. l `1f*represen-ts.v the side wail, and. 2 andra .the

prisesipaneldike sections .5 of massive construe-- tion, with articulations at their meetinghcrizontal: edges on one side of the` plane inv 'which it meets the sea-t 4.. The articulations between the damper sectionsl comprise lugs 6a. relatedfas articulating tongues `to the grooves 6h, the-sections' 'ott the tongues and" grooves being such that the members can be assembledonly by-a sidewise` telescopingmovement. Thus, the form of Varticulation"sl'iown Vin Figures 1f,- 2 and 13, theflug 6a is of dovetail formand the groove- 6b is ve'crrespondingly undercut, ibut theparts are arranged atr a substantial angleto the planeflof the damper. fFigure'-shows a somewhat similar dovetail lug. 6a entering an undercut'groove 6b', Whichpartsare substantially 'parallel tothe plane ofthe damper. In Figuref', lug 'la enters agroove, Tlb--Whickth a .reduced slot 'Tc to re@- ceive the,neCk'7dfCQnI1i6etingthe lug 'law-ith the next lower panel.k In Figure 6, theA tongue-8a enters the groove 8b and rests through. means of; its oiset 8c upon the ledge 8dofthe groove.

f AIrifFigiire 7 the ,T-shapedflugfga entersthe `groove 9b and rests with its lug 9a upon the l'with' the'n'ext lower panel. Y y A1x1- each of the forms of articulating construction shown, vertical support is' transmitted in ledgesv 9d' While the neck Qcconnectsl the head bothjdirections through means of impinging sur- `faces which tendto force; the-sectionsbr panels of' thefdamp'er into alignmentun'der thei'load transmitted, particularly'under mimic-narl sap'h portland to a greater or less degreeuwhen the Yconstruction .is under support -bysuspension'. 'Fliesel impingingiaces also perform theservice or' limiting gas` seepageto. a degree-y `winch.v will prevent cutting tongues of flame licking over the edges of the members of the articulation. Thus, in Figure 3 the opposing faces 6c, 6d, and in Figure 4 the opposing faces 6c and 6d', enter into impingement under columnar support or support in which each panel rests by gravity upon the 'one beneath it and force the members into anti-tipping or anti-buckling relation by the forms of the faceswhereas, undery support by'` suspension-.face Gegenters similarly into stable seating against the face Gf in Figure 3,

and the face 6e similarly coacts with the face 6]" in Figure 4. In Figure 5 the faces 7c and 'Id' impingejunder columnar support with an anti- "tippingeiect which tends to keep the panels im alignment, while arcuatev faces 'le and r'71 impinge under support Vby suspension. In Figure a strong control against tipping, while the opposedtaces of the parts 8c and 8d2 implngeunder support by suspension. In Figure 7 thermes 9a andd impinge.under'Y columnar support, while the faces 9eqand 97 impinge under Support by'suspensiom w i 1 s i v lin-Figures' 8 and; 9': is shownsa construction similar to-that shown in .'Eigure, but without the underlapping portion Sd'andswithout the functioning of thefoppo'sed Vfaces '8c' 8d" tn columnar support. Instead. of suspensional and. columnar` support by opposed shoulders on'th'e parts,-Figures .8 .and 9 userivets 8i passing through the wallsfof the groovefSU' andthe lntervening tongue `8u@ the.; holes `31el inthe tongue sa being elongatedhorizontally to allow for differential yexpansion for the two articulated membersww.- f Y f with' any of theseveral: constructions shown, thek damperpanels are all free expand and contract. independently one oit the others changes 'inv temperature; i .the 'tendency to buck-t lingis resisted. bythe shapesof the impnging raices; articulation#constructions areally on the face ofthe damper opposite to that through 'which itimpinges i against its seat; there is sufficient/tolerance in the `constructionf of the articulations'topermit relative angular movement within. limits demanded'lby any #expected distortion'- ot the seat 4; and the damper will remainl at hall times in condition forv manipula tion whilemaintaining its seatfunder gravity. I claim:v l i' f 91am ay dampen-for high temperature nues, damper" platrie'ls,v and means articulating meeting marginal portions: oi said panels aganistseparation. in ubotlr vertical directions, said means, comprising lazdovetail. llugon one panel andi an `undercut groove ons tht-anotherpanel,r and the .faces which .define said vlug and groove and through. which they imping'e during inter-snpv ,portlbetween-.the,units being hat...

AV2.v In audamper for vhigh temperature nues, damper; panels,v and.;y means articulating marginal portionsof sai'dnpanels; comprisingf a 'dovetail Ylugpn one vpanel and an. `undercut :groove-on. theother panel; the faces through l g g Y 1,991,016 plane of .the damper; said articulating mem-f` bers comprising tongues or lugs entering undercut grooves and having opposed faces through which they seat one against lthe other in both vertical directions; at least those faces through which the articulating members seat one upon `said damper, constructed at their meeting marginal portions with telescopicallyY connected articulating joint means comprisingtongues or the plane of the damper and thereby establishing inter-support between the panels, both when the damper is under suspension and when it is in columnar support from the bottom; the surfaces through which the .members of the articulating means seat one against the other when the damper is supported in suspension,v being fiat and permitting limited hinging movement `between the panels but normally resisting such hinging movement.

5. In a damper, panels constituting units'of said damper constructed at their meeting marginal portions with telescopically connected articulating joint means comprising tongues or lugs on one` unit entering grooves on the other unit; said articulating means seating one againsty the other in both vertical directions in the 'plane of the damper and thereby establishing interdamper is under suspension and when it is in support betweenthe panels both Vwhen the" columnar support from thebottom; the surfaces; through which the members of the articulating means seat one against the other when the damper is supported in suspension, and also those surfaces throughwhich said articulatingv means seat when the damper is in columnar support from below, being flat and permitting limited xhingins movement between the `panels but normally resisting such hinging movement 6. A damper for high temperature iiues` adapted to be suspended from the top or supported from the bottom comprising: a plurality of transverse panels, said panels being formed at their marginal meeting edges to provide articulated `joints between said panels, said joints including cooperating faces formed to support each panel upon the panel` therebeneath when thereabove when said damper is suspended from the top. z i 7. A valve structure for the iiues of a furnace comprising guides disposed inthe side Walls of 

